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Summary: The tectonic and geomagnetic signiącance of paleomagnetic
observations from volcanic rocks from central Afar, Africa
Gary D. Acton aY
*, Abera Tessema b
, Michael Jackson c
, Roger Bilham d
a
Ocean Drilling Program, Texas ApM University, 1000 Discovery Drive, College Station, TX 77845, USA
b
Department of Geophysics, Ethiopian Institute of Geological Surveys, P.O. Box 40630, Addis Ababa, Ethiopia
c
University NAVSTAR Consortium (UNAVCO), P.O. Box 3000, University of Colorado, Boulder, CO 80307-3000, USA
d
Geological Sciences and CIRES, University of Colorado, Boulder, CO 80309, USA
Received 14 March 2000; received in revised form 1 June 2000; accepted 1 June 2000
Abstract
Deformation throughout Afar over the past 2 myr has been characterized by widespread and intense crustal
fragmentation that results from inhomogeneous extension across the region. In eastern Afar, this situation has evolved
to localized extension associated with the westward propagation of the Gulf of Aden/Gulf of Tadjurah seafloor
spreading system into the Asal^Ghoubbet Rift. During the gradual process of rift propagation and localization, crustal
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